30 | Keysight | E4991B Impedance Analyzer - Data Sheet
Typical Material Measurement Accuracy When Using
Options 002 and 007 (continued)
Calibration temperature: Calibration is performed at an environmental temperature
within the range of 23 °C ± 5 °C. Measurement accuracy doubles when calibration
temperature is 5 °C to 18 °C or 28 °C to 40 °C. Measurement temperature range of
main unit, test head, and their connecting cable. Within ± 5 °C of calibration
temperature
Oscillator level: Same as the level set at calibration
Point averaging factor: ≥ 8
Typical permittivity measurement accuracy2:
[r´ accuracy
E[ = Δ[´r m
[´r m
:
[
± 5 + 10 + 0.5 × t + 0.25 ×
´
+
100
1– 13
f √[´r m
r m
2
f
[´r m
t
[%] (at tand < 0.1)
Loss tangent accuracy of [´r (= Δtand) :
± (Ea + Eb ) (at tand < 0.1)
where,
Ea
=
at Frequency ≤ 1 GHz
0.0025
t
0.1
1– 13
+
0.002 +
×
+ (0.008 × f )
2
f
[´r m
√
f [´r m
Eb
=
Δ[´r m
[´r m
1
100
0.002
t
×
+ [´r m
× tand
f
=
=
=
=
Measurement frequency [GHz]
t
Thickness of MUT (material under test) [mm]
Measured value of [´r
[´r m
tand
Measured value of dielectric loss tangent
2. The accuracy applies when the electrode pressure of the 16453A is set to maximum.
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